Latin: M. oblique internal abdominis

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  • to the overview Musculature


The inner oblique abdominal muscle (abdominal internal muscle) is located as a three-sided, about 1 cm thick abdominal muscle directly below the outer oblique abdominal muscle. He is the smallest of the three lateral abdominal muscles.

Approach, origin, innervation

Approach: 9th-12th rib , linea alba


  • Superficial lumbar spine ( thoracolumbar fascia )
  • middle lip of the iliac crest ( Linea intermedia cristae iliacae )
  • lateral half of the inguinal ligament

Innervation: Nn. intercostal VIII-XII

Illustration of inner oblique abdominal muscle

Illustration of the inner oblique abdominal muscle: chest from the front (A) and from the side (B)

Inner oblique abdominal muscle

  1. Inner oblique abdominal muscle -
    Musculus obliquus
    internal abdominis
  2. Iliac scoop -
    Ala ossis ilii
  3. Sacrum -
    Os sacrum
  4. Coccyx -
    Os coccygis
  5. Pubis -
    Os pubis
  6. Seated leg -
    Os ischii
  7. Iliac crest -
    Crista iliaca
  8. 9th Rib - Costa IX
  9. Rib cartilage -
    Cartilago costalis
  10. Sternum - Sternum
  11. First lumbar vertebra -
  12. Vertebra lumbalis I

An overview of all pictures by Dr-Gumpert can be found at: medical pictures

How is the muscle trained / contracted?

The contraction occurs in the same way as in the oblique abdominal muscles, but only reversed.

The following exercises are therefore particularly suitable:

  • Lateral pushups
  • Abdominal Crunch

In abdominal crunch, the effect on the internal oblique abdominal muscle can be enhanced by turning the upper body sideways during contraction.

An overview of all relevant topics in the field of weight training you will find in the overview weight training

How is the straight abdominal muscle stretched?

If the upper body is tilted or turned to one side, at the same time the opposite side is stretched.

Detailed information can be found at:

  • stretching
  • stretching


In a one-sided contraction, the fuselage is tilted to one side and turned. He works with the outer oblique abdominal muscles of the opposite side together. In addition, the internal oblique abdominal muscle (abdominal internal muscle) fixes the trunk when lifting and carrying heavy loads.

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